The sixth round of tax reform represents a significant change in amendments to the Income Tax Act, Act on Contributions, Profit Tax Act, Value Added Tax Act, Local Taxes Act, Cash Transaction Fiscalisation Act and particularly in changes in the calculation of personal income. Amendments to the Income Tax Act, Act on Contributions and Local Taxes Act affect the calculation of personal income in order to increase net salary of taxpayers. The reduction of the base for calculating contributions for pension insurance based on the principle of solidarity between generations, change in the income tax rate and increase in the amount of personal deduction directly affect an individual's disposable income and tax relief for taxpayers. This paper elucidates the basic elements necessary for calculation of personal income in the Republic of Croatia before and after 2024 tax reform. Additionally, a comparison of calculation of personal income before and after tax reform along with an analysis of the affects of amendments to the Income Tax Act and Act on Contributions is conducted. Ultimately, the goal of the master thesis is to determine, through examples, the similarities and differences in calculation of personal income before and after tax reform, and whether the effects of the sixth round of tax reform have indeed contributed to increasing the net salay of taxpayers and to what extent they have affected their purchasing power.